ESPCI web site
PMMH’s weekly seminar is held every Friday at 11 am (map)
Stéphane Perrard
Etienne Reyssat
Virgile Thiévenaz
PMMH
BARRE CASSAN
BAT A 1ER ETAGE CASE 18
7 QUAI SAINT BERNARD
75005 PARIS
France
Tel : (33) 1 40 79 45 22
Séminaire PMMH - Leonardo Gordillo (Universidad De Santiago de Chile)
Drop-impact dynamics on solid surfaces : Evolution of impact force
In this talk, I will give an overview of our latest advances in understanding the dynamics of drop impacts on dry solid surfaces. By synchronizing high-speed photography with fast force sensing, we simultaneously measured the temporal evolution of the shape and impact force of impacting drops over a wide range of Reynolds numbers (Re). At high Re, the early-time evolution of impact force follows a square-root scaling. This observation provides direct evidence on the existence of upward propagating self-similar structures during the initial impact of liquid drops. At lower-Re impact, viscous forces gradually set in and the early-time scaling of the impact force of viscous drops changes. We used an analytical perturbation method to study this process that successfully predicts the quantitative increase of the maximum impact force with decreasing Re. This results provides a solid basis to understand the temporal evolution of impact forces across the inertial and viscous regimes and sheds new light on the self-similar dynamics during drop impact.
The audience is composed of people with rather heterogeneous backgrounds including specialists in solids, fluids, granular flows, statistical physics... so the idea is to keep your talk understandable by people not necessarily working in your field... The seminar time slot runs from 11am to noon so the best is to make the talk last around 45 minutes to leave some time for discussion.
- Séminaires ESPCI-ENS de biophysique
- Séminaires du Département de Physique de l’ENS
- Séminaires du Laboratoire d’Hydrodynamique de l’X
- Séminaire de Mécanique d’Orsay (page web FAST)
- Séminaire de Mécanique d’Orsay (page web LIMSI)
- Séminaire de Mécanique des Fluides de l’Institut Jean le Rond d’Alembert
- Séminaires du laboratoire MSC, Paris VII
- Séminaires Gulliver
Link to cofee seminar (internal, every Thursday)
